I have a clip of Doug Henning on Merv Griffin circa 1978, performing 3 coins across; each traveling invisibly one at a time from hand to hand to join his "magic ring" with a clink.
He finishes w/Han Ping Chien causing three to fly at same time--Merv is stunned, and Angie Dickinson audibly gasps in amazement.
I just shot an iPhone video of that old VHS tape--w/crappy tracking after 30 years--and will send it to all who send their email addresses to:
Use Doug on Merv as the subject.
Not great video quality, but I've surely seen worse, and come on: it's Doug on Merv w/Angie late 70s